03、动态代理--CGLib引入增强

package com.offer.note.Java基础.动态代理.CGLib引入增强;public interface Browser {void visitInternet();
}

 

package com.offer.note.Java基础.动态代理.CGLib引入增强;/*** 目标类：被代理类** @author: xueguanfeng* @date: 2018-05-15 09:57*/
public class ChromeBrowser implements Browser {@Overridepublic void visitInternet() {System.out.println("visit YouTube");}//非接口方法public void listenToMusic() {System.out.println("listen to Cranberries");}
}

 

package com.offer.note.Java基础.动态代理.CGLib引入增强;import org.springframework.cglib.proxy.Enhancer;
import org.springframework.cglib.proxy.MethodInterceptor;
import org.springframework.cglib.proxy.MethodProxy;import java.lang.reflect.Method;/*** CGLib引入增强** @author: xueguanfeng* @date: 2018-05-15 13:08*/
public class CglibIntroductionBrowserProxy implements MethodInterceptor, Game {private static CglibIntroductionBrowserProxy proxy = new CglibIntroductionBrowserProxy();private CglibIntroductionBrowserProxy() {}public static CglibIntroductionBrowserProxy getInstance() {return proxy;}public <T> T getProxy(Class<T> clazz) {//第二个入参：指定产生的代理类实现的接口，指定的接口中的方法，需要通过反射来调用，不能通过CGLib来触发调用return (T) Enhancer.create(clazz, new Class[]{Game.class}, this);}@Overridepublic Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {Object retVal;//判断执行方法是否为指定代理类实现的接口中的方法，如果是，则通过“反射”调用接口的实现类。if (method.getDeclaringClass().isInterface()) {method.setAccessible(true);System.out.println("=================通过反射调用目标方法===================");encrypt();retVal = method.invoke(this, args);decrypt();//如果不是，则通过CGLib来触发。} else {System.out.println("=================CGLib触发目标方法调用===================");encrypt();retVal = proxy.invokeSuper(obj, args);decrypt();}return retVal;}@Overridepublic void start() {System.out.println("start a game");}增强////*** 加密*/private void encrypt() {System.out.println("encrypt ...");}/*** 解密*/private void decrypt() {System.out.println("decrypt ...");}}

 

package com.offer.note.Java基础.动态代理.CGLib引入增强;/*** 测试类** @author: xueguanfeng* @date: 2018-05-15 13:10*/
public class CglibIntroductionDynamicProxyTest {public static void main(String[] args) {//动态生成的代理类的实例ChromeBrowser browser = CglibIntroductionBrowserProxy.getInstance().getProxy(ChromeBrowser.class);browser.visitInternet();browser.listenToMusic();//动态生成的代理类实现了Game接口（return (T) Enhancer.create(clazz, new Class[]{Game.class}, this);）Game game = (Game) browser;game.start();}
}